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What are the symptoms of Down syndrome?

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The extra genetic material is responsible for the physical characteristics of the syndrome: low muscle tone, flattish facial features, an upward slant to the eyes and epicanthal folds (which were the basis for the former name, mongolism), a single crease across the palm, hyperflexibility of the joints, and a displastic middle phalanx on the fifth finger. People with Down syndrome have an increased incidence of infection, childhood leukemia, congenital heart defects, and respiratory problems, but modern medical treatment has improved the life expectancy from 9 (in 1910) to 55 (in 1995). Mental retardation varies widely, from minimal to severe.

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Get more facts and information about Down syndrome . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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